Merge branch 'cleanup_develop' into 'develop'

src/gpu/GridGenerator/grid/GridBuilder/LevelGridBuilder.cpp

src/gpu/GridGenerator/grid/GridInterface.cpp

src/gpu/GridGenerator/grid/distributions/Distribution.cpp

...gpu/GridGenerator/grid/distributions/DistributionTest.cpp

src/gpu/VirtualFluids_GPU/Calculation/PlaneCalculations.cpp

...U/DataStructureInitializer/GridReaderFiles/GridReader.cpp

...tructureInitializer/GridReaderGenerator/GridGenerator.cpp

src/gpu/VirtualFluids_GPU/FindQ/FindQ.cpp

src/gpu/VirtualFluids_GPU/GPU/AdvectionDiffusion27chim.cu

src/gpu/VirtualFluids_GPU/GPU/AdvectionDiffusionBCs27.cu

src/gpu/VirtualFluids_GPU/GPU/CP27.cu

src/gpu/VirtualFluids_GPU/GPU/Calc2ndMoments27.cu

src/gpu/VirtualFluids_GPU/GPU/CalcConc27.cu

src/gpu/VirtualFluids_GPU/GPU/CalcMac27.cu

src/gpu/VirtualFluids_GPU/GPU/Cascade27.cu

src/gpu/VirtualFluids_GPU/GPU/Cumulant27.cu

src/gpu/VirtualFluids_GPU/GPU/Cumulant27chim.cu

src/gpu/VirtualFluids_GPU/GPU/Cumulant_F3_27.cu

src/gpu/VirtualFluids_GPU/GPU/DragLift27.cu

src/gpu/VirtualFluids_GPU/GPU/ExchangeData27.cu